import java.util.Arrays;

public class test {
    public static void transform(int[] arr){
        for (int i = 0; i <arr.length; i++) {
            arr[i]=arr[i]*2;
        }
    }
        public static void main(String[] args) {
        int[]arr={1,2,3,4,5};
        System.out.println(Arrays.toString(arr));
        transform(arr);
        System.out.println(Arrays.toString(arr));
    }
}
